Great scientists in medieval Europe
Anthemius of Tralles (ca. 474 ? ca. 534), a professor of geometry and architecture, authored many influential works on mathematics and was one of the architects of the famed Hagia Sophia, the largest building in the world at its time. His works were among the most important source texts in the Arab world and Western Europe for centuries after.
John Philoponus (ca. 490?ca. 570), also known as John the Grammarian, a Byzantine philosopher, launched a revolution in the understanding of physics by critiquing and correcting the earlier works of Aristotle. In the process he proposed important concepts such as a rudimentary notion of inertia and the invariant acceleration of falling objects. Although his works were repressed at various times in the Byzantine Empire, because of religious controversy, they would nevertheless become important to the understanding of physics throughout Europe and the Arab world.
Paul of Aegina (ca. 625?ca. 690), considered by some to be the greatest Byzantine surgeon, developed many novel surgical techniques and authored the medical encyclopedia Medical Compendium in Seven Books. The book on surgery in particular was the definitive treatise in Europe and the Islamic world for hundreds of years.
The Venerable Bede
The Venerable Bede (ca. 672?735), monk of the monasteries of Wearmouth and Jarrow who wrote a work On the Nature of Things, several books on the mathematical / astronomical subject of computus, the most influential entitled On the Reckoning of Time. He made original discoveries concerning the nature of the tides and his works on computus became required elements of the training of clergy, and thus greatly influenced early medieval knowledge of the natural world.
Abbas Ibn Firnas (810 ? 887), a polymath and inventor in Muslim Spain, made contributions in a variety of fields and is most known for his contributions to glass-making and aviation. He developed novel ways of manufacturing and using glass . He was also the first to attempt controlled flight by flying a primitive hang glider in 875 (the origin of the concept is often erroneously attributed to Bacon or da Vinci).
Pope Sylvester II (c. 946?1003), a scholar, teacher, mathematician, and later pope, reintroduced the abacus and armillary sphere to Western Europe after they had been lost for centuries following the Greco-Roman era. He was also responsible in part for the spread of the Hindu-Arabic numeral system in Western Europe.
Maslamah al-Majriti (died 1008), a mathematician, astronomer, and chemist in Muslim Spain, made novel contributions in many areas, from new techniques for surveying to updating and improving the astronomical tables of al-Khwarizmi and inventing a process for producing mercury oxide. He is most famous, though, for having helped transmit knowledge of mathematics and astronomy to Muslim Spain and Christian Western Europe.
Abulcasis (936-1013), a physician and scientist in Muslim Spain, is considered to be the father of modern surgery. He wrote numerous medical texts, developed many innovative surgical instruments, and developed a variety of new surgical techniques and practices. His texts were considered the definitive works on surgery in Europe until the Renaissance.
Constantine the African (c. 1020?1087), a Christian native of Carthage, is best known for his translating of ancient Greek and Roman medical texts from Arabic into Latin while working at the Schola Medica Salernitana in Salerno, Italy. Among the works he translated were those of Hippocrates and Galen.
Arzachel (1028?1087), the foremost astronomer of the early second millennium, lived in Muslim Spain and greatly expanded the understanding and accuracy of planetary models and terrestrial measurements used for navigation. He developed key technologies including the equatorium and universal latitude-independent astrolabe.
Avempace (died 1138), a famous physicist from Muslim Spain who had an important influence on later physicists such as Galileo. He was the first to theorize the concept of a reaction force for every force exerted.
Avenzoar (1091?1161), from Muslim Spain, was the earliest known experimental surgeon, for introducing an experimental method in surgery, as he was the first to employ animal testing in order to experiment with surgical procedures before applying them to human patients. He also performed the earliest dissections and postmortem autopsies on both humans as well as animals.
Robert Grosseteste (1168?1253), Bishop of Lincoln, was the central character of the English intellectual movement in the first half of the 13th century and is considered the founder of scientific thought in Oxford. He had a great interest in the natural world and wrote texts on the mathematical sciences of optics, astronomy and geometry. In his commentaries on Aristotle's scientific works, he affirmed that experiments should be used in order to verify a theory, testing its consequences. Roger Bacon was influenced by his work on optics and astronomy.
St. Albert the Great
Albert the Great (1193?1280), Doctor Universalis, was one of the most prominent representatives of the philosophical tradition emerging from the Dominican Order. He is one of the thirty-three Saints of the Roman Catholic Church honored with the title of Doctor of the Church. He became famous for his vast knowledge and for his defence of the pacific coexistence between science and religion. Albert was an essential figure in introducing Greek and Islamic science into the medieval universities, although not without hesitation with regard to particular Aristotelian theses. In one of his most famous sayings he asserted: "Science does not consist in ratifying what others say, but of searching for the causes of phenomena." Thomas Aquinas was his most famous pupil.
Jordanus de Nemore (late 12th, early 13th century) was one of the major pure mathematicians of the Middle Ages. He wrote treatises on mechanics ("the science of weights"), on basic and advanced arithmetic, on algebra, on geometry, and on the mathematics of stereographic projection.
Roger Bacon (1214?94), Doctor Admirabilis, joined the Franciscan Order around 1240 where, influenced by Grosseteste, ibn Firnas and others, he dedicated himself to studies where he implemented the observation of nature and experimentation as the foundation of natural knowledge. Bacon was responsible for making the concept of "laws of nature" widespread, and contributed in such areas as mechanics, geography and, most of all, optics.
The optical research of Grosseteste and Bacon established optics as an area of study at the medieval university and formed the basis for a continuous tradition of research into optics that went all the way up to the beginning of the 17th century and the foundation of modern optics by Kepler.
Ibn al-Baitar (died 1248), a botanist and pharmacist in Muslim Spain, researched over 1400 types of plants, foods, and drugs and compiled pharmaceutical and medical encyclopedias documenting his research. These were used in the Islamic world and Europe until the 19th century.
St. Thomas Aquinas
Thomas Aquinas (1227?74), Doctor Angelicus, was an Italian theologian and friar in the Dominican Order. As his mentor Albert the Great, he is a Catholic Saint and Doctor of the Church. His interests were not only in philosophy; he was also interested in alchemy, having written an important treatise titled Aurora Consurgens. However, his greatest contribution to the scientific development of the period was having been mostly responsible for the incorporation of Aristotelianism into the Scholastic tradition, and in particular his Commentary on Aristotle's Physics was responsible for developing one of the most important innovations in the history of physics, first posited by his mentor Averroes for celestial bodies only, namely the notion of the inertial resistant mass of all bodies universally, subsequently further developed by Kepler and Newton in the 17th century. (See Pierre Duhem's analysis The 12th century birth of the notion of mass which advised modern mechanics. from his Systeme Du Monde at )
John Duns Scotus (1266?1308), Doctor Subtilis, was a member of the Franciscan Order, philosopher and theologian. Emerging from the academic environment of the University of Oxford. where the presence of Grosseteste and Bacon was still palpable, he had a different view on the relationship between reason and faith as that of Thomas Aquinas. For Duns Scotus, the truths of faith could not be comprehended through the use of reason. Philosophy, hence, should not be a servant to theology, but act independently. He was the mentor of one of the greatest names of philosophy in the Middle Ages: William of Ockham.
William of Ockham (1285?1350), Doctor Invincibilis, was an English Franciscan friar, philosopher, logician and theologian. Ockham defended the principle of parsimony, which could already be seen in the works of his mentor Duns Scotus. His principle later became known as Occam's Razor and states that if there are various equally valid explanations for a fact, then the simplest one should be chosen. This became a foundation of what would come to be known as the scientific method and one of the pilars of reductionism in science. Ockham probably died of the Black Plague. Jean Buridan and Nicole Oresme were his followers.
Jean Buridan (1300?58) was a French philosopher and priest. Although he was one of the most famous and influent philosophers of the late Middle Ages, his work today is not renowned by people other than philosophers and historians. One of his most significant contributions to science was the development of the theory of Impetus, that explained the movement of projectiles and objects in free-fall. This theory gave way to the dynamics of Galileo Galilei and for Isaac Newton's famous principle of Inertia.
Nicole Oresme (c. 1323?82) was an intellectual genius and perhaps the most original thinker of the 14th century. A theologian and bishop of Lisieux, he was one of the principal propagators of the modern sciences. Notwithstanding his strictly scientific contributions, Oresme strongly opposed astrology and speculated about the possibility of extraterrestrial life. He was the last great European intellectual to live before the Black Plague, an event that had a very negative impact in the intellectual life of the ending period of the Middle Ages.
 Byzantine world
Albertus Magnus These displayed his prolific habits and literally encyclopedic knowledge of topics such as logic, theology, botany, geography, astronomy, astrology, mineralogy, chemistry, zoology, physiology, phrenology and others; all of which were the result of logic and observation. He was perhaps the most well-read author of his time. He digested, interpreted and systematized the whole of Aristotle's works, gleaned from the Latin translations and notes of the Arabian commentators, in accordance with Church doctrine. Most modern knowledge of Aristotle was preserved and presented by Albertus.
Many of the works commonly attributed to Hypatia are believed to have been collaborative works with her father, Theon Alexandricus; this kind of auctorial uncertainty being typical for the situation of feminine philosophy in Antiquity. A partial list of specific accomplishments:
Her contributions to science are reputed to include the charting of celestial bodies and the invention of the hydrometer, used to determine the relative density and gravity of liquids. Her pupil Synesius, bishop of Cyrene, wrote a letter defending her as the inventor of the astrolabe, although earlier astrolabes predate Hypatia's model by at least a century - and her father had gained fame for his treatise on the subject.
Nicolau Copernicus February 19, 1473 – May 24, 1543) was the first astronomer to formulate a scientifically-based heliocentric cosmology that displaced the Earth from the center of the universe. His epochal book, De revolutionibus orbium coelestium (On the Revolutions of the Celestial Spheres), is often regarded as the starting point of modern astronomy and the defining epiphany that began the Scientific Revolution.
Leonardo Da Vinci Leonardo di ser Piero da Vinci ( pronunciation (help·info), April 15, 1452 – May 2, 1519) was an Italian polymath, being a scientist, mathematician, engineer, inventor, anatomist, painter, sculptor, architect, botanist, musician and writer. Leonardo has often been described as the archetype of the renaissance man, a man whose unquenchable curiosity was equaled only by his powers of invention. He is widely considered to be one of the greatest painters of all time and perhaps the most diversely talented person ever to have lived. Helen Gardner says "The scope and depth of his interests were without precedent...His mind and personality seem to us superhuman, the man himself mysterious and remote".[1